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  1. Article: Influence of Hydrocarbon Moiety of DMMP on Flame Propagation in Lean Mixtures.

    Babushok, V I / Linteris, G T / Katta, V R / Takahashi, F

    Combustion and flame

    2019  Volume 171

    Abstract: Phosphorus-containing compounds (PCCs) have been found to be significantly more effective than ... ...

    Abstract Phosphorus-containing compounds (PCCs) have been found to be significantly more effective than CF
    Language English
    Publishing date 2019-04-14
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2000795-4
    ISSN 1556-2921 ; 0010-2180
    ISSN (online) 1556-2921
    ISSN 0010-2180
    DOI 10.1016/j.combustflame.2016.06.019
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Stability of lifted flames in centerbody burner

    Katta, V.R / Stouffer, Scott / Roquemore, W.M

    Combustion and Flame. 2011 June, v. 158, no. 6

    2011  

    Abstract: The centerbody burner was designed with the objective of understanding the coupled processes of formation, growth, and burn-off of soot through decoupling them using recirculation zones (RZs). Experimentally it was found that the sooting characteristics ... ...

    Abstract The centerbody burner was designed with the objective of understanding the coupled processes of formation, growth, and burn-off of soot through decoupling them using recirculation zones (RZs). Experimentally it was found that the sooting characteristics of the centerbody burner could be altered dramatically via simple changes in the operating conditions. One of the interesting operating regimes in which a flame lifts off and forms a column of soot was identified when oxygen in the annulus air jet was reduced sufficiently. This paper describes the numerical studies performed to aid the understanding of lifted flames in the centerbody burner. A time-dependent, axisymmetric, detailed-chemistry CFD model is used. Combustion and PAH formation are modeled using the Wang–Frenklach (99 species and 1066 reactions) mechanism, and soot is simulated using a two-equation model of Lindstedt. Calculations have predicted the structure of the lifted flame very well. Two RZs [outer (ORZ) and inner (IRZ)] are formed between the fuel and air jets. A diffusion flame that is lifted-off the centerbody plate anchors steadily to the outer periphery of the ORZ. A near-perfect match between the computed and measured flame lift-off heights is achieved. RZs transport soot that is formed in the flame toward the face of the centerbody and create the soot column. Ethylene and its lighter fuel fragments that are formed in the RZs diffuse toward the annulus air jet and establish a mixing layer with the inwardly diffusing oxygen. Heat diffusing away from the RZs initiates autoignition reactions in the mixing layer. A flame with a triple-flame-base structure becomes established at a location where the ignition-delay time matches the residence time. Soot that is transported into the RZs is found to have a significant effect on the flame lift-off height. Numerical experiments are performed to aid the understanding of the relationship between soot and flame lift-off. Radiation from the soot decreases the temperature, slows the autoignition process, and increases the lift-off height. Soot oxidation consumes O and OH radicals, slows the autoignition reactions, and increases the lift-off height.
    Keywords air ; combustion ; ethylene ; free radicals ; fuels ; heat ; mixing ; models ; oxygen ; polycyclic aromatic hydrocarbons ; soot ; temperature
    Language English
    Dates of publication 2011-06
    Size p. 1149-1159.
    Publishing place Elsevier Inc.
    Document type Article
    ZDB-ID 2000795-4
    ISSN 1556-2921 ; 0010-2180
    ISSN (online) 1556-2921
    ISSN 0010-2180
    DOI 10.1016/j.combustflame.2010.10.022
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Experimental and computational study on partially premixed flames in a centerbody burner

    Katta, V.R / Forlines, R.A / Roquemore, W.M / Anderson, W.S / Zelina, J / Gord, J.R / Stouffer, S.D / Roy, S

    Combustion and Flame. 2011 Mar., v. 158, no. 3

    2011  

    Abstract: The centerbody burner was designed with the objective of understanding the coupled processes of soot formation, growth, and burnout. Fuel that issues from the center of the burner establishes two flame zones – one associated with the recirculation zone ( ... ...

    Abstract The centerbody burner was designed with the objective of understanding the coupled processes of soot formation, growth, and burnout. Fuel that issues from the center of the burner establishes two flame zones – one associated with the recirculation zone (RZ) and the other, with the trailing jet. The sooting characteristics in these two flame zones can be quite different because of variations in residence time and transport of reactants and products. Calculations performed for this burner operating under a partially premixed fuel jet suggested that soot in the RZ decreases and that soot in the trailing jet flame increases with the amount of premixing. An experimental and numerical study is performed to aid the understanding of these differences. A time-dependent, axisymmetric, detailed-chemistry computational-fluid-dynamics (CFD) model known as Unsteady Ignition and Combustion using ReactioNs (UNICORN) is used for simulating flames under different equivalence-ratio conditions. Combustion and PAH formation are modeled using the Wang–Frenklach (99 species and 1066 reactions) mechanism, and soot is simulated using a two-equation model of Lindstedt. A Lagrangian-based particle-tracking model is used for understanding the evolution of soot-like particles. Flame and recirculation-zone structures and soot in the experiments are identified using direct photographs taken with and without Mie scattering from soot particles as well as laser-induced-incandescence (LII) measurements. Calculations predict the structures of the partially premixed centerbody flames for various equivalence ratios reasonably well. Experiments confirm the predicted soot suppression in the RZs and enhancement of soot in the trailing jet flame when air is added to the fuel jet. It is found that flame movement in the RZ increases soot-particle burnout and, thereby, reduces the amount of soot within the RZ. As the flame moves closer to the fuel jet, more soot becomes entrained into the inner vortex. Motion of soot-like particles explained the spiral rings observed in the experiment. Increased particle burnout with partial premixing leads to shrinkage of soot spirals.
    Keywords air ; combustion ; fuels ; models ; photographs ; polycyclic aromatic hydrocarbons ; shrinkage ; soot
    Language English
    Dates of publication 2011-03
    Size p. 511-524.
    Publishing place Elsevier Inc.
    Document type Article
    ZDB-ID 2000795-4
    ISSN 1556-2921 ; 0010-2180
    ISSN (online) 1556-2921
    ISSN 0010-2180
    DOI 10.1016/j.combustflame.2010.09.022
    Database NAL-Catalogue (AGRICOLA)

    Full text online

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  4. Article ; Online: Global attitudes in the management of acute appendicitis during COVID-19 pandemic

    Ielpo, B. / Podda, M. / Pellino, G. / Pata, F. / Caruso, R. / Gravante, G. / Di Saverio, S. / Gallo, G. / Lui, R. / Orengia, A. / Chowdary, A. / Kulkarni, A. / Kuvvetli, A. / Navarro, A. / Pisanu, A. / Smith, A. / Ibiricu, A. C. / Nacion, A. J. D. / Alsaleh, A. /
    Alhazmi, A. / Elmabri, A. / Wani, A. / Rencuzogullari, A. / Lasarte, A. S. / Rubio, A. V. / Bavikatte, A. / Kumar, A. / Jamiri, A. -R. / Padilla, A. M. A. / Cacurri, A. / de San Ildefonso, A. / Porcu, A. / Sartori, A. / Rocca, A. / Yanez, A. P. / Becaria, A. / Solis-Pena, A. / Sretenovic, A. / Urbistondo, A. / Bandin, A. / Najar, A. / De Luca, A. / Boddy, A. / Charalabopoulos, A. / Tzivanakis, A. / Amendola, A. / de Velasco, A. R. -G. / Yildirim, A. C. / Frontali, A. / Toure, A. O. / Garcia-Granero, A. / Roldan, A. M. / Larrainzar, A. S. / Ratnayake, A. S. / Gonzalez-Ganso, A. M. / Minaya-Bravo, A. M. / Das, A. / Bondurri, A. / Costanzi, A. / Lucchi, A. / Mazzari, A. / Musig, A. / Peloso, A. / Piano, A. / Police, A. / Mihailescu, A. / Pouy, A. / Romano, A. / Iossa, A. / Leonetti, A. C. / Guariniello, A. / Isaac, A. / Bovi, A. P. D. / Chessa, A. / Tromba, A. / Martinez, A. A. / Brillantino, A. / Caira, A. / Castaldi, A. / Ferronetti, A. / Giuliani, A. / Prestera, A. / la Medina, A. R. -D. / Tarasconi, A. / Tornambe, A. / Picciariello, A. / Ioannidis, A. / Leppaniemi, A. / Khan, A. / Rashid, A. / Perez-Sanchez, A. L. E. / Mittal, A. / Mitul, A. R. / Mehraj, A. / Laharwal, A. / Dorisme, A. / Marinis, A. / Iqbal, A. / Moncada, A. / Braccio, B. / Alkhafaji, B. / de Andres Asenjo, B. / Martin-Perez, B. / Perez, B. S. / Creavin, B. / Cali, B. / Pascotto, B. / Stubbs, B. / Retes, B. Z. / Jovanovic, B. / Goh, B. K. P. / Sensi, B. / Biddau, C. / Gazia, C. / Vallicelli, C. / Fagundes, C. A. / Santacruz, C. C. / Chirico, C. / Diaz, C. J. G. / Petrola, C. / Rodriguez, C. S. / Benitez, C. Y. / Dammaro, C. / Faro, C. L. / Reinke, C. / Paez, C. D. / Oliva, C. / Paranjape, C. / Thomas, C. / Chia, C. F. / Kong, C. K. / De Lucia, C. / Chao, C. O. / Arcudi, C. / Guerci, C. / Chia, C. / Parise, C. / Folliero, C. / Varela, C. / Ferguson, D. M. / Camacho, D. / Popowich, D. / Lima, D. S. / Rega, D. / Delogu, D. / Zigiotto, D. / Vinci, D. / D'Antonio, D. / Parini, D. / Merlini, D. A. / Zimmerman, D. D. E. / Moro-Valdezate, D. / Pertile, D. / Giusti, D. M. / Keller, D. S. / Tarik, D. / Kalivaci, D. / Mazingi, D. / Maldonado-Pintado, D. G. / Sasia, D. / Linardoutsos, D. / Osilli, D. / Murrone, D. / Russello, D. / Rodas, E. / Roa, E. A. A. / Ricciardi, E. / Rosso, E. / Saladino, E. / Flores-Villalba, E. / Ajs, E. R. / Smith-Singares, E. / Baili, E. / Kouroumpas, E. / Bourmpouteli, E. / Douka, E. / Martin-Perez, E. / Guaitoli, E. / Samadov, E. / Francone, E. / Vaterlini, E. / Morales, E. / Pena, E. / Zhao, E. / Andres, E. D. P. / Benzoni, E. / Erdas, E. / Pinotti, E. / Colas-Ruiz, E. / Aytac, E. / Laterza, E. / Agastra, E. / Foianini, E. / Moscoso, E. / Laviano, E. / Marra, E. / Cardamone, E. / Licardie, E. / Mpaili, E. / Pinna, E. / Varo, E. / Navarro, F. M. / Marino, F. / Medas, F. / Romano, F. / Maraska, F. / Saliu, F. / Madrid, F. / Rosa, F. / Mastella, F. / Gheza, F. / Luvisetto, F. / Alconchel, F. / Vieira, F. M. / Pareja, F. / Agresta, F. / Luna, F. / Bonilla, F. / Cordera, F. / Burdio, F. / Mendoza-Moreno, F. / Flores, F. M. / Aranda, F. P. / Taylor, F. / Ramos, F. L. / Fernandes, F. / Tropeano, F. P. / Balestra, F. / Bianco, F. / Ceci, F. / Colombo, F. / Di Marzo, F. / Ferrara, F. / Lancellotti, F. / Lazzarin, F. / Litta, F. / Martini, F. / Pizza, F. / Roscio, F. / Virdis, F. / Antona, F. B. / Ramirez, F. C. / Fernandez, F. M. / Llinares, F. O. / Quezada, F. / Schlottmann, F. / Herrera-Almario, G. / Massaferro, G. / Bislenghi, G. / van Ramshorst, G. / Luglio, G. / Bointas, G. / Kampouroglou, G. / Papadopoulos, G. / Manrique, G. A. / Calini, G. / Nastri, G. / Formisano, G. / Galiffa, G. / Palini, G. M. / Colucci, G. / Pagano, G. / Vanni, G. / Pattacini, G. C. / De Paola, G. / Lisi, G. / Partida, G. / Bellanova, G. / De Nobili, G. / Necchi, G. S. / Sinibaldi, G. / Tebala, G. / Bagaglini, G. / Izzo, G. / Argenio, G. / Brisinda, G. / Candilio, G. / Di Grezia, G. / Esposito, G. / Faillace, G. / Frazzetta, G. / La Gumina, G. / Nigri, G. / Romeo, G. / Amatriain, G. C. / Ortega, G. / Martin-Martin, G. / Stavrou, G. A. / Gunadi, / Ugon, G. A. / Machain, G. / Marcucci, G. / Martinez-Mier, G. / Machain, G. M. / Nari, G. / Calvo, H. / Fathy, H. / Hamilto, / Ahmed, H. / Faraj, H. / Nava, H. / Macias, H. O. / Nikaj, H. / Solano, H. / Khan, H. A. / Alarcon, H. S. / Ebied, H. / Giani, I. / Ateca, I. V. / Neri, I. / Roman, I. A. S. / Fidoshev, I. / Rodriguez, I. M. / Negoi, I. / Ortega, I. / Bernescu, I. / Russo, I. S. / Rodriguez, I. V. / Palomares, I. / Baltazar, I. / Torrejimeno, I. J. / Jurado, I. M. C. / Reccia, I. / Hussain, I. / Toledo, I. B. / Mora-Guzman, I. / Dogaru, I. / Romic, I. / Balciscueta, I. / Kenington, J. C. / Sagolsem, J. / Jang, J. Y. / Olivier, J. / Lammel-Lindemann, J. / Dziakova, J. / Villavicencio, J. I. R. / Salinas, J. / Parreira, J. P. J. G. / Jovanovic, / Perez, J. R. / Reyes, J. A. S. / Luque, J. A. M. / Mak, J. / Rodriguez, J. S. / Kok, J. H. H. / Krook, J. / Diaz-Elizondo, J. A. / Castell, J. / Garcia-Flores, J. E. / Navalon, J. M. J. / Rodrigues, J. M. S. / Pereira, J. / Gomez, J. T. C. / Luque, J. B. / del Olmo, J. C. M. / Salamea, J. C. / Olivier, J. F. C. / Laina, J. L. B. / Ordonez, J. M. / Gutierrez, J. / Abba, J. / Sofi, J. A. / Sherafgan, K. / Sahnan, K. / Yanaga, K. / Beatson, K. / Asim, L. / Alvarez, L. / Siragusa, L. / Farber, L. / Ong, L. / Athanasios, L. / Garcia-Bruna, L. / De Martino, L. / Ferrario, L. / Giordano, L. / Gordini, L. / Pio, L. / Ponchietti, L. / Moletta, L. / Curella, L. / Poggi, L. / Taglietti, L. / Bonavina, L. / Conti, L. / Goffredi, L. / Ruiz, L. A. G. / Barrionuevo, L. / Fregoso, L. E. / Cabrera, L. F. / Rodriguez, L. G. / Grande, L. / Osoria, L. G. / Gonzalez, L. J. K. / Sanchez-Guillen, L. / Tallon-Aguilar, L. / Tresierra, L. / Giavarini, L. / Hasabelnabi, M. / Odovic, M. / Uemura, M. / Khan, M. / Artiles-Armas, M. / David, M. / Di Martino, M. / Spampinato, M. G. / Ribeiro, M. A. F. / Viola, M. / Angrisani, M. / Calussi, M. / Cannistra, M. / Catarci, M. / Cereda, M. / Conte, M. / Giordano, M. / Pellicciaro, M. / Marino, M. V. / Vaterlini, M. E. / Jimenez, M. F. / Lolli, M. G. / Bellini, M. I. / Lemma, M. / Chiarello, M. M. / Nicola, M. / Arrigo, M. / Mejia, M. C. / Manrique, M. M. / Rodriguez-Lopez, M. / Serradilla-Martin, M. / Lara, M. Z. / Martinez, M. / Bagnall, M. / Peter, M. / Lara, M. C. / Gomez, M. J. / Paniagua-Garcia-Senorans, M. / Gonzalez, M. P. / Rutegard, M. / Salo, M. / Franceschilli, M. / Silveri, M. / Veroux, M. / Pezzulo, M. / Nardi, M. / Rottoli, M. / Tolonen, M. / Ciro, M. P. / Zuluagua, M. / Cannavo, M. / Cervellera, M. / Iacobone, M. / Montuori, M. / Dominguez, M. G. / Bingol-Kologlu, M. / Tahir, M. / Lim, M. / Wilson, M. S. / Wilson, M. / Campanelli, M. / Bisaccia, M. / De Rosa, M. / Maruccia, M. / Paterno, M. / Pisano, M. / Torre, M. / Trevino, M. / Zuolo, M. / Hernandez Bartolome, M. A. / Farina, M. / Pera, M. / Calvo, M. P. / Sotelo, M. / Thway, M. M. / Hassan, M. / Hassan, M. S. E. / Azfar, M. / Bouhuwaish, M. / Taha, M. / Zaieem, M. / Korkoman, M. / Guraieb, M. / Shalaby, M. / Raza, M. A. / Younis, M. U. / Elhadi, M. / Ali, M. Z. / Quazi, N. / Dudi-Venkata, N. N. / Alselaim, N. / Loria, N. / Ramirez, N. V. / Than, N. W. / Smart, N. / Trelles, N. / Pinto, N. / Allievi, N. / Petrucciani, N. / Antonacci, N. / Cillara, N. / Gica, N. / Cristiana, N. D. / Krystek, N. / Falco, N. / Pecorelli, N. / Tamini, N. / Dallas, N. A. / Machairas, N. / Brito, N. / Fieturi, N. A. / Ortega, N. / Mercado, O. A. / Irkorucu, O. / Alsherif, O. / Valles, O. / Ioannidis, O. / Palmas, O. H. / Palmas, O. I. H. / Guadarrama, O. S. / Bozbiyik, O. / Omelanczuk, P. / Ottolino, P. / Rodrigues, P. / Ruiz, P. / Campenni, P. / Chiarade, P. / Olivares, P. P. / Baroffio, P. / Panaccio, P. / Wintringer, P. / Di Fronzo, P. / Talento, P. / Favoriti, P. / Sendino, P. / Marsanic, P. / Mifsut, P. / Andrade, P. / Ajawin, P. / Abadia-Barno, P. / Castaneda, P. A. N. / Arevalos, P. O. S. / Bellver, P. P. / Koh, P. S. / Souza, P. / Major, P. / Bali, R. S. / Khattar, R. M. / Melo, R. B. / Ebrahiminia, R. / Azar, R. / Murga, R. L. / Pirolo, R. / Brady, R. / Davies, R. J. / Dholakia, R. / Rattan, R. / Singhal, R. / Lim, R. / Angelico, R. / Isernia, R. M. / Tutino, R. / Faccincani, R. / Peltrini, R. / Carrera-Ceron, R. / Tejos, R. / Kashyap, R. / Fajardo, R. / Lozito, R. / Pareja, R. M. / Garbarino, S. / Morales-Conde, S. / Benli, S. / Mansour, S. / Flores, S. / Suarez, S. L. / Ben, S. L. / Fuentes, S. / Napetti, S. / de Guzman, S. O. / Awad, S. / Weckmann Lujan, S. A. / Gentilli, S. / Grimaldi, S. / Pizarro, S. O. / Tayar, S. / Nabi, S. / Chan, S. M. / Junaid, S. / Rojas, S. / Monetti, S. / Garcia, S. / Salvans, S. / Tenconi, S. / Shaw, S. / Santoni, S. / Parra, S. A. / Cardenas, S. / Perez-Bertolez, S. / Chiappetta, S. / Dessureault, S. / Delis, S. / Bonapasta, S. A. / Rausei, S. / Scaringi, S. / Keswani, S. / Ali, S. M. / Cetinkunar, S. / Fung, T. L. D. / Rawashdeh, T. / Lopez, T. N. / De Campos, T. / Duque, T. C. / Perra, T. / Liakakos, T. / Daskalakis, T. / Barnes, T. / Koeter, T. / Zalla, T. / Gonzalez, T. E. / Elosua, T. / Campagnaro, T. / Brown, T. / Luoto, T. / Oumar, T. A. / Giustizieri, U. / Grossi, U. / Bracale, U. / Rivas, U. / Sosa, V. / Testa, V. / Andriola, V. / Tonini, V. / Balassone, V. / Celentano, V. / Progno, V. / Raju, V. / Carroni, V. / Cavallaro, V. / Katta, V. R. / De Simone, V. / Romaguera, V. P. / Orozco, V. H. G. / Luraschi, V. / Rachkov, V. / Turrado-L, V. / Visag-Castillo, V. / Dowling, V. / Graham, V. / Papagni, V. / Vigorita, V. / Fonseca, V. C. / Carneros, V. J. / Bellato, V. / Goncalves, W. / Powers, W. F. / Grigg, W. / Bechstein, W. O. / Lim, Y. B. / Altinel, Y. / Golubovic, Z. / Balciscueta, Z.

    ACIE Appy Study

    2020  

    Abstract: Background: Surgical strategies are being adapted to face the COVID-19 pandemic. Recommendations on the management of acute appendicitis have been based on expert opinion, but very little evidence is available. This study addressed that dearth with a ... ...

    Abstract Background: Surgical strategies are being adapted to face the COVID-19 pandemic. Recommendations on the management of acute appendicitis have been based on expert opinion, but very little evidence is available. This study addressed that dearth with a snapshot of worldwide approaches to appendicitis. Methods: The Association of Italian Surgeons in Europe designed an online survey to assess the current attitude of surgeons globally regarding the management of patients with acute appendicitis during the pandemic. Questions were divided into baseline information, hospital organization and screening, personal protective equipment, management and surgical approach, and patient presentation before versus during the pandemic. Results: Of 744 answers, 709 (from 66 countries) were complete and were included in the analysis. Most hospitals were treating both patients with and those without COVID. There was variation in screening indications and modality used, with chest X-ray plus molecular testing (PCR) being the commonest (19·8 per cent). Conservative management of complicated and uncomplicated appendicitis was used by 6·6 and 2·4 per cent respectively before, but 23·7 and 5·3 per cent, during the pandemic (both P < 0·001). One-third changed their approach from laparoscopic to open surgery owing to the popular (but evidence-lacking) advice from expert groups during the initial phase of the pandemic. No agreement on how to filter surgical smoke plume during laparoscopy was identified. There was an overall reduction in the number of patients admitted with appendicitis and one-third felt that patients who did present had more severe appendicitis than they usually observe. Conclusion: Conservative management of mild appendicitis has been possible during the pandemic. The fact that some surgeons switched to open appendicectomy may reflect the poor guidelines that emanated in the early phase of SARS-CoV-2.
    Keywords covid19
    Subject code 610
    Language English
    Publishing country it
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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